Saying his experience is “emblematic of the abuses running rampant in the world of big-time college football,” a former high-school star quarterback on Tuesday filed a lawsuit accusing University of Florida football coach Billy Napier, a top Gators booster and others of wrongdoing related to a $13.85 million endorsement deal gone sour. The federal lawsuit filed by Jaden Rashada centers on a seismic shift in college sports in recent years that has allowed athletes to profit from their names, images, and likenesses in what are commonly known as NIL agreements. Rashada, who grew up in Pittsburgh,…